Hi, this patch adds built-in preprocessor symbols __ARM_PCS, 
__ARM_PCS_VFP to indicate the current soft/hard-float calling 
convention, as described in the draft ACLE.

If approved, please help to apply to trunk, as I don't have commit 
rights yet.

Thanks,
Chung-Lin

2010-07-22  Chung-Lin Tang  <cltang@codesourcery.com>

	* config/arm/arm.h (TARGET_CPU_CPP_BUILTINS): Define __ARM_PCS or
	__ARM_PCS_VFP to indicate soft/hard-float calling convention.